pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / util / packed / Direct16.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/packed/Direct16.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/packed/Direct16.java
new file mode 100644 (file)
index 0000000..b4f6282
--- /dev/null
+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/util/packed/Direct16.java
@@ -0,0 +1,97 @@
+package org.apache.lucene.util.packed;
+
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import org.apache.lucene.store.DataInput;
+import org.apache.lucene.util.RamUsageEstimator;
+
+import java.io.IOException;
+import java.util.Arrays;
+
+/**
+ * Direct wrapping of 16 bit values to a backing array of shorts.
+ * @lucene.internal
+ */
+
+class Direct16 extends PackedInts.ReaderImpl
+        implements PackedInts.Mutable {
+  private short[] values;
+  private static final int BITS_PER_VALUE = 16;
+
+  public Direct16(int valueCount) {
+    super(valueCount, BITS_PER_VALUE);
+    values = new short[valueCount];
+  }
+
+  public Direct16(DataInput in, int valueCount) throws IOException {
+    super(valueCount, BITS_PER_VALUE);
+    short[] values = new short[valueCount];
+    for(int i=0;i<valueCount;i++) {
+      values[i] = in.readShort();
+    }
+    final int mod = valueCount % 4;
+    if (mod != 0) {
+      final int pad = 4-mod;
+      // round out long
+      for(int i=0;i<pad;i++) {
+        in.readShort();
+      }
+    }
+
+    this.values = values;
+  }
+
+  /**
+   * Creates an array backed by the given values.
+   * </p><p>
+   * Note: The values are used directly, so changes to the values will
+   * affect the structure.
+   * @param values   used as the internal backing array.
+   */
+  public Direct16(short[] values) {
+    super(values.length, BITS_PER_VALUE);
+    this.values = values;
+  }
+
+  public long get(final int index) {
+    return 0xFFFFL & values[index];
+  }
+
+  public void set(final int index, final long value) {
+    values[index] = (short)(value & 0xFFFF);
+  }
+
+  public long ramBytesUsed() {
+    return RamUsageEstimator.NUM_BYTES_ARRAY_HEADER +
+            values.length * RamUsageEstimator.NUM_BYTES_SHORT;
+  }
+
+  public void clear() {
+    Arrays.fill(values, (short)0);
+  }
+
+  @Override
+  public Object getArray() {
+    return values;
+  }
+
+  @Override
+  public boolean hasArray() {
+    return true;
+  }
+}